Thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination

Abstract

The present invention relates to a thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination, which is contained in a layer to be laminated on a layer composed of a carbon-fiber reinforced plastic, wherein the thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination contains a styrene-based thermoplastic elastomer and a polymer modified by an α,β-unsaturated carboxylic acid, the styrene-based thermoplastic elastomer contains components (a) to (d), and a concentration of an α,β-unsaturated carboxylic acid derived from the polymer modified by the α,β-unsaturated carboxylic acid is 0.01 to 10% by mass.

The invention claimed is: 
     
       1. A thermoplastic elastomer composition, comprising:
 polyolefin modified by an α,β-unsaturated carboxylic acid, wherein 
 a concentration of an α,β-unsaturated carboxylic acid derived from the polyolefin modified by the α,β-unsaturated carboxylic acid in the thermoplastic elastomer composition is from 0.01 to 10% by mass; and 
 a styrene based thermoplastic elastomer comprising: 
 component (a): a hydrogenated block copolymer which is a hydrogenated product of an (A)-(B) block copolymer and/or an (A)-(B)-(A) block copolymer composed of a vinyl aromatic compound polymer block (A) and a conjugated diene polymer block (B), wherein at least 80% of double bonds of the conjugated diene moiety of the conjugated diene polymer block (B) is saturated through hydrogenation, and a weight average molecular weight thereof is 80,000 to 1,000,000; 
 component (b): a softening agent selected from a mineral oil-based hydrocarbon having a weight average molecular weight of from 300 to 2,000, a synthetic resin-based hydrocarbon having a weight average molecular weight of from 300 to 2,000 or a mixture thereof; 
 component (c): a hydrogenated block copolymer composed of an (A)-(C)-(A) triblock copolymer which is composed of a vinyl aromatic compound polymer block (A) and a conjugated diene polymer block (C), wherein the conjugated diene polymer block (C) is constituted of isoprene; and a part or all of carbon-carbon double bonds based on isoprene are hydrogenated; and 
 component (d): an olefin-based crystalline resin; 
 wherein based on 100 parts by mass of the sum total of the component (a) and the component (b), a content of the component (c) is 20 to 300 parts by mass. 
 
     
     
       2. The thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination according to  claim 1 ,
 wherein based on 100 parts by mass of the sum total of the component (a) and the component (b), a content of the component (d) is 10 to 100 parts by mass; and 
 based on 100% by mass of the sum total of the component (a) and the component (b), an occupying proportion of the component (a) is 20 to 80% by mass and an occupying proportion of the component (b) is 80 to 20% by mass. 
 
     
     
       3. The thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination according to  claim 1 , wherein the polyolefin modified by the α,β-unsaturated carboxylic acid is a polypropylene modified by a maleic anhydride. 
     
     
       4. The thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination according to  claim 1 , wherein the component (a) is a hydrogenated block copolymer having a content of the vinyl aromatic compound polymer block (A) of 10 to 50% by mass. 
     
     
       5. The thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination according to  claim 1 , wherein the component (c) is a hydrogenated block copolymer in which the content of the vinyl aromatic compound polymer block (A) is 10 to 50% by mass, a weight average molecular weight is 30,000 to 300,000, and at least 50% of double bonds of the isoprene moiety is saturated through hydrogenation. 
     
     
       6. The thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination according to  claim 1 , wherein the component (b) is a mineral oil-based hydrocarbon having a weight average molecular weight of from  300  to  2 , 000  which is a paraffin-based oil. 
     
     
       7. The thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination according to  claim 1 , wherein the component (d) is at least one olefin-based crystalline resin selected from the group consisting of a homopolypropylene, a block polypropylene, and a random polypropylene, each having a melt flow rate of 0.01 to 100 g/10 min at 230° C. and a load of 21.2 N. 
     
     
       8. A laminated molded article comprising a layer composed of a carbon fiber reinforced plastic and a thermoplastic elastomer layer composed of a thermoplastic elastomer laminated on the carbon fiber reinforced plastic,
 wherein the thermoplastic elastomer contains a styrene-based thermoplastic elastomer and a polyolefin modified by an α,β-unsaturated carboxylic acid, 
 the styrene-based thermoplastic elastomer contains the following components (a) to (d), and 
 a concentration of an α,β-unsaturated carboxylic acid derived from the polyolefin modified by the α,β-unsaturated carboxylic acid is 0.01 to 10% by mass: 
 component (a): a hydrogenated block copolymer which is a hydrogenated product of an (A)-(B) block copolymer and/or an (A)-(B)-(A) block copolymer composed of a vinyl aromatic compound polymer block (A) and a conjugated diene polymer block (B), wherein at least 80% of double bonds of the conjugated diene moiety of the conjugated diene polymer block (B) is saturated through hydrogenation, and a weight average molecular weight thereof is 80,000 to 1,000,000; 
 component (b): a softening agent selected from a mineral oil-based hydrocarbon having a weight average molecular weight of from 300 to 2,000, a synthetic resin-based hydrocarbon having a weight average molecular weight of from 300 to 2,000 or a mixture thereof; 
 component (c): a hydrogenated block copolymer composed of an (A)-(C)-(A) triblock copolymer which is composed of a vinyl aromatic compound polymer block (A) and a conjugated diene polymer block (C), wherein the conjugated diene polymer block (C) is constituted of isoprene, and a part or all of carbon-carbon double bonds based on isoprene are hydrogenated; and 
 component (d): an olefin-based crystalline resin; 
 wherein based on 100 parts by mass of the sum total of the component (a) and the component (b), a content of the component (c) is 20 to 300 parts by mass. 
 
     
     
       9. The laminated molded article according to  claim 8 ,
 wherein 
 based on 100 parts by mass of the sum total of the component (a) and the component (b), a content of the component (c) is 20 to 300 parts by mass and a content of the component (d) is 10 to 100 parts by mass, and 
 based on 100% by mass of the sum total of the component (a) and the component (b), an occupying proportion of the component (a) is 20 to 80/6 by mass and an occupying proportion of the component (b) is 80 to 20% by mass. 
 
     
     
       10. The laminated molded article according to  claim 8 , wherein the polyolefin modified by the α,β-unsaturated carboxylic acid is a polypropylene modified by maleic anhydride. 
     
     
       11. The laminated molded article according to  claim 9 , wherein the component (a) is a hydrogenated block copolymer having a content of the vinyl aromatic compound polymer block (A) of 10 to 50% by mass. 
     
     
       12. The laminated molded article according to  claim 8 , wherein the component (c) is a hydrogenated block copolymer in which a content of the vinyl aromatic compound polymer block (A) is 10 to 50% by mass, a weight average molecular weight is 30,000 to 300,000, and at least 50% of double bonds of the isoprene moiety is saturated through hydrogenation. 
     
     
       13. The laminated molded article according to  claim 9 , wherein the component (b) is a mineral oil-based hydrocarbon having a weight average molecular weight of from 300 to 2,000 which is a paraffin-based oil. 
     
     
       14. The laminated molded article according to  claim 9 , wherein the component (d) is at least one olefin-based crystalline resin selected from the group consisting of a homopolypropylene, a block polypropylene, and a random polypropylene, each having a melt flow rate of 0.01 to 100 g/10 min at 230° C. and a load of 21.2 N. 
     
     
       15. The laminated molded article according to  claim 8 , wherein a sliding material layer is contained on the surface of the thermoplastic elastomer layer on the opposite side to the carbon fiber reinforced plastic. 
     
     
       16. An automobile parts structure comprising the laminated molded article according to  claim 8 . 
     
     
       17. A shipping parts structure comprising the laminated molded article according to  claim 8 . 
     
     
       18. A power parts structure comprising the laminated molded article according to  claim 8 . 
     
     
       19. A method of bonding a carbon fiber reinforced plastic comprising bonding the carbon fiber reinforced plastic with the thermoplastic elastomer composition of  claim 1 . 
     
     
       20. The thermoplastic elastomer for carbon fiber reinforced plastic bonding lamination according to  claim 1 , wherein a weight average molecular weight of the component (c) is from 30,000 to 300,000. 
     
     
       21. The laminated molded article according to  claim 8 , wherein a weight average molecular weight of the component (c) is from 30,000 to 300,000.